BRPI0807766B1 - female end protection device of a tubular threaded joint component with anti-lock brake - Google Patents

Abstract

female end protection device of a tubular threaded joint component with anti-locking brake The present invention relates to a device (d) which is dedicated to the protection of a female end (ef) of a joint component (t) tubular threading for drilling and exploration of hydrocarbon wells, fitted with an internal threading (fi) and an annular end (s1) and inner surface (s2) positioned upstream and downstream of the internal threading (fi) respectively and presenting respectively a first and a second chosen orientation. said device (d) comprises a body (cp) provided with an external threading (fe) intended to operate in conjunction with the internal threading (fi) and a first (11) and second (12) flexible sealing elements of annular type positioned respectively upstream and downstream of the outer thread (fe) and charged with ensuring first and second tightness respectively at the level of the inner annular (s2) and end (s1) surfaces. the first (11) and second (12) sealing elements have a third and a fourth orientation chosen, at least one of which differs from an angle of at least 10 ° with the second or first corresponding orientation prior to tapping. device (d) at the female end (ef), and are deformable by axial flexion so as to acquire by surface contact with the inner annular surface (s2) and annular end surface (s1) at least partially opposing energy an unforeseen unscrewing when the female end (ef) is screwed into the body (cp) in an end position.

Description

Report of the Invention Patent for "DEVICE FOR PROTECTION OF A FEMALE END OF A TUBULAR THREADED JOINT COMPONENT WITH ANTIDESATRATE BRAKE". The present invention relates to tubular threaded joint components, used for example in oil applications, and more precisely to the female end protection of some of these components. By "component" herein is meant any element or fitting used to drill or explore a well and intended to be joined by threading to another component to form a tubular threaded joint therewith. The component may for example be a relatively long tube (notably about a dozen meters long), a tubular glove a few tens of centimeters long, an accessory of such tubes (suspension device or " hanger, cross-over or cross-over, safety valve, drill rod connector or tool joint, sub, and the like).

The components are generally joined together to be lowered into hydrocarbon wells or similar wells to form a drill rig, casing or liner column, or pipe column. tubing (farm columns). The API 5CT specification issued by the American Petroleum Institute (API), equivalent to ISO 11960: 2004 issued by the International Standardization Organization (ISO), governs tubes used as casing or tubing, and the API 5B specification defines standard threading for these tubes. API Specification 7 defines shoulder threaded connectors for rotary drill rods.

Manufacturers of tubular threaded joint components have also developed so-called upper threaded joints that feature threading with specific geometries, and specific means that give them better service performance, notably in mechanical strength and tightness. Examples of such upper threaded joints and specific means are for example described in EP 0488912, US 4,494,777 and EP 0767335.

Precisioned components comprise a threaded female end that is intended to be screwed into a threaded male end of another drilling or exploration component. It is therefore indispensable that their female end be damaged as little as possible, polluted and deteriorated between the moment when they leave their manufacturing chain and the one in which they are used, but also between two successive uses. It will be understood that it is in fact necessary to protect against corrosion, dust and shocks (or blows) not only the internal threading but also the annular surface (abutment or anvil) which each have specific and complementary functions, particularly with a view to ensuring a tightness in use.

Precision component ends are usually coated just prior to joining them with a grease with anti-cleaning properties. API RP 5A3 (formerly API Bul. 5A2) or ISO 13678: 2000 document defines such greases and the application modalities of these greases are described in API RP 5C1. However, greases according to API RP 5A3 have a number of drawbacks linked to their toxic constituent content, notably lead, the excess amount of grease applied and the need to apply grease immediately before the components drop. in the well.

It has thus been proposed, notably in US 6,933,264, US 6,869,111 and WO 2003/102457, to replace the grease, applied with the brush at the end of the component, with a thin layer of predetermined thickness applied to the mill. , a "semi-dry" lubricant free from heavy metals. It has also been proposed, notably in US 6,027,145, EP 1211451 and FR 0510503 (patent application not yet published), to replace the brush-applied grease at the end of the component with a thin, predetermined, machine-applied layer. , a dry lubricant based on solid lubricants.

In such cases of use of dry or semi-dry lubricant in plant, it is therefore also and more especially necessary to protect the lubricant layer with which the ends of the components are coated as much as possible from mechanical withdrawal and pollution (sand , debris) harmful to the effectiveness of the lubricant.

In order to obtain such protection (s), as required by the API 5CT specification (in paragraph 12.2), a protective device at the male and female ends of the tubular threaded joint components is required. Numerous such devices have been proposed for female ends, notably in EP 0148807 and US 2006/0042709.

This latter document is more particularly aimed at joint protectors that are previously coated with lubricant in the plant. The protector described therein comprises a body provided, on the one hand, with an external threading intended to operate in conjunction with the internal threading of the female end to be protected, and, on the other hand, a first and second locking elements. annular-type flexible seals positioned downstream and upstream of the outer thread respectively and charged with ensuring first and second tightness respectively at the inner and end annular surfaces which are positioned upstream and downstream of the inner end threading female. The first sealing element is intended to surround the zone containing the inner annular surface of the female end while ensuring a watertight seal. Being relatively massive, it is poorly adapted to absorb the dimensional differences in the female end and / or its protector resulting from fabrication and / or temperature variations. On the other hand, it may deform in the presence of strong temperature variations and thus no longer be in close contact with the inner annular surface of the female extremity, thus favoring the spontaneous detachment of the protector in the presence of vibrations, notably generated during transport. , and / or temperature variations which may fluctuate from -40 ° C to + 80 ° C. The invention therefore aims to improve the situation.

It therefore proposes a device, on the one hand, for protecting the female end of a component of a tubular threaded joint for drilling and exploration of hydrocarbon wells, which is internally provided with at least one internal threading and a surface. end ring and an inner surface (possibly annular) positioned respectively upstream and downstream of the internal thread and having respectively a first and a second chosen orientation, and, on the other hand, comprising a body provided with an outer thread intended for operate in conjunction with the internal threading and of a first and second annular-type sealing elements positioned respectively upstream and downstream of the outer threading and in charge of ensuring a first and a second tightness respectively at the inner surface and annular surface end of the female end. The annular end surface here is the most upstream part of the female end. As a result, everything that comes after this annular end surface is situated downstream. The annular end surface is thus positioned upstream of the internal thread while the internal (possibly annular) surface is positioned downstream of that internal thread. Likewise, the first sealing element is the upstream part of the body (protector) of the device. Accordingly, the first sealing element is positioned upstream of the outer threading while the second sealing element is positioned downstream of that outer threading.

This device is characterized by the fact that its first and second sealing elements, on the one hand, have a third and a fourth orientation chosen, of which at least one differs from an angle of at least 10 ° with the second or the first. corresponding orientation (prior to tapping the device at the female end), and on the other hand, are deformable by axial flexion in order to acquire by surface contact with the inner annular surfaces and annular end surface of the female end an energy that is at least partially opposes an unforeseen release (anti-release brake effect) when that female end is screwed into the body in a final position. The first sealing element may be realized in the form of an annular tongue. The annular tongue of the first sealing element may be connected to the body (shield) by the inner periphery of the latter and may project outwards. Molding is thus facilitated. The annular tongue is well protected against elements coming from inside the tube that are likely to accidentally deteriorate. If the atmospheric pressure increases, the annular tongue of the first sealing element may allow air to pass to balance the pressure. This avoids sticking the device to a female element which makes its voluntary unscrewing difficult. The protective device according to the invention may decline in a number of variants, at least some of which may be combined, and in particular: the inner surface of the female end may be an annular stop surface; its body may be arranged such that during the screwing phase the first sealing member contacts the inner annular surface of the female end before the second sealing member contacts the annular end surface of that same female end. ; - its body may be arranged such that during the screwing phase and at the moment when the first sealing member contacts the inner annular surface of the female end, the second sealing member is positioned at an axial distance from the surface. annular end of that same female end between about 0.5 mm and about 1 mm; - the first and fourth orientations may for example differ from an angle of from about 10 ° to about 30 °. For example this angle is about 15 °; - in variant or complement, the second and third orientations may for example differ from an angle of between 10 ° and about 30 °. For example this angle is about 15 °; - the angle between the second and third orientations may decrease during tapering; - the second sealing element may be made in the form of an annular tongue; its body may be extended downstream of the second sealing element by a damping element; It can be made of a thermoplastic material, for example made of one piece by molding. The latter may for example be chosen from the group comprising at least polycarbonate, polyoxymethylene or polyacetal (POM) -based mixtures and high-density (PE-HD) or ultra-high-density (PE-UHD) polyethylenes. ); - its first and second sealing elements may be integral with its body (shield), - the inner surface of the female end may be a radially tightness sealing surface.

Other features and advantages of the invention will appear upon examination of the detailed description below and the accompanying drawings, in which: - Figure 1 schematically illustrates in perspective view an example of an embodiment of a protective device according to the invention is an exemplary embodiment of a female end of a VAM TOP type tubular threaded joint; FIG. 2 schematically illustrates in another perspective view the exemplary embodiment of the protective device of FIG. 1; Figures 3A and 3B show schematically, respectively in perspective and cross-sectional views according to the axis XX of the component, an example of a first sealing element of the protective device of figures 1 and 2; 4A and 4B schematically illustrate, respectively in perspective and cross-sectional views according to the axis XX of the component, an example of embodiment of a second element. 1, 2, - Figures 5A, 5B and 5C schematically illustrate, in partial cross-sectional views according to the axis XX of the component, three intermediate joining stages at the female end of Figure 1. of the protection device of figure 1, equipped with a first and second sealing elements illustrated in figures 3 and 4, - figures 6A and 6B are enlargements of the joints [protective device / female end] of figure 5C, which respectively comprising the first and second sealing elements in a first embodiment, - Figure 7 schematically illustrates, in a partial sectional view according to the axis XX of the component, a fourth intermediate stage of union at the female end of the housing. Figure 1 of the protective device of Figure 1, fitted with the first and second sealing elements shown in Figures 3 and 4, - Figures 8 and 9 are enlargements. of the joining zones [protective device / female end] of Figure 7, which respectively comprise the first and second sealing elements, - Figure 10 schematically illustrates in partial cross-sectional view according to the axis XX of the component. , a fifth (final) coupling stage at the female end of FIG. 1 of the protective device of FIG. 1, equipped with the first and second sealing elements shown in FIGS. 3 and 4, - FIGURES 11A and 11B are enlargements of the zones. [protection device / female end] of Figure 10, which respectively comprise the first and second sealing elements, and - Figure 12 schematically illustrates, in a perspective view, the female end of the tubular-type threaded joint VAM TOP of figures 1 and 5 to 11 provided with the protective device shown in figures 1 to 11 and positioned in its final position.

The accompanying drawings may not only serve to complete the invention, but may also contribute to its definition, if any. The object of the invention is to limit the possibilities of spontaneous unscrewing of a device for protecting the threaded female end of a tubular component of a tubular threaded joint (for drilling or drilling hydrocarbon wells or the like), against mechanical damage, pollution (chemical and material) and deterioration (corrosion), from the moment they leave their manufacturing chain to the moment they are used (with several possible disassembly protection), but also between two successive uses.

It is considered hereinafter that the component is intended for drilling or exploration of hydrocarbon wells and that it is equipped with a female end of a VAM family [deposit mark] or equivalent tubular glove joint or equivalent.

But, the invention is not limited to either this type of component or the precarious female end type. The invention in fact relates to any type of tubular threaded joint component for drilling or exploration, provided that it is equipped with a female end provided with at least one internal thread and an end ring surface and an inner surface. (also void in case of a VAM TOP type gasket) positioned respectively upstream and downstream of the internal thread and having respectively a first and a second orientation chosen.

On the other hand, "female end" is herein understood to mean a female component end (tube, sleeve or fitting) provided with an internal thread and an annular end surface and an inner surface (also annular in the case of a joint type VAM TOP) positioned upstream and downstream of the internal thread respectively. The term female end (EF) therefore means not only the annular end surface located at the free end of component (T), but also any part of component (T) comprising (female) means for connecting to another joint component. tubular threaded fitting with male connection means (male end). It is recalled that a component (T) comprises a body or current part (PC) terminated by a female end (EF) or a male end. Internal threading can be done in one or several distinct threaded parts arranged according to cylindrical or conical surfaces.

Where the threaded part or portion is tapered, the latter may be subdivided into a so-called perfect-threaded subpart, the profile of which is constant and without irregularity or imperfection (for example of the burr type) and a so-called fading or imperfect sub-part, the height of which it is progressively decreasing and whose profile may present irregularities or imperfections. The internal threading of the female end of the component may comprise at least two distinct axially and / or radially threaded portions of each other, each of which portions may comprise perfect and fading threads. The female end of the component comprises a free end portion terminated by an annular end surface having a first orientation. The latter is substantially transverse with respect to the direction (XX) of the component (sleeve) in the case of a VAM TOP type joint (it then defines a null angle (<f> 1) or rather small with respect to the plane perpendicular to the XX direction. ).

That female end also comprises at least one inner surface (i.e. disposed near the inner peripheral surface of the T component) annular (in the considered example of a VAM TOP type joint) which then defines a housing for a male end of another component. intended to be joined to the component concerned. It may optionally also comprise one or more metal / metal sealing surfaces (at the free end, downstream of the outer thread or between two threaded parts) with the male end considered. The shielding device according to the invention is preferably designed to protect both the threading and these sealing surfaces, and if possible at least one of the annular end surfaces S1 and inner S2, from damage or injury, dust and / or corrosion.

By "exterior" is meant herein an element arranged according to a surface (or a surface) which is oriented in a direction radially opposite the axis XX of the female end. By contrast, herein is meant "internal" an element (or a surface) which is oriented in the direction of the XX axis of the female end. The inner annular surface has a second orientation. This latter forms a non-zero angle (φ2) (eg of the order of 15 °) with respect to the plane perpendicular to the direction (XX) of the component in the case of a VAM TOP type joint (it then defines an axial stop ring surface). of an inverse internal stop).

The embodiments set forth below, by way of non-limiting examples, are all for a female end of a VAM TOP glove tubular threaded joint sleeve. But it also applies to other types of gloved or gloved threaded joints. Reference is first made to Figures 1 to 5 to present the invention and to detail its implementation in the form of an example embodiment.

A protective device D according to the invention comprises a CP body intended to be screwed to the female (threaded) end EF of a T component. The CP body is made in the form of a one-piece sleeve. It is in charge of protecting the inner thread F1 of the female end EF and its end ring surfaces S1 and inner S2 which have first and second orientations respectively. It comprises an end portion P2 provided at its end with a first annular-type flexible sealing member L1 and charged with ensuring a first sealing at the inner annular surface S2 of the female end EF when its device D is positioned in an end position ( 10 to 12). This end portion P2 is extended on the opposite side of the first sealing element L1 by an intermediate part P3 containing an outer threading FE into which the internal threading F1 of the female end EF may be inserted. This intermediate part P3 also comprises a second annular-type flexible sealing member L2 which is responsible for securing a second seal at the annular end surface S2 of the female end EF when its device D is placed in its final position (shown in FIGS. 10). to 12).

According to the invention, the first L1 and second L2 sealing elements are deformable by axial flexion in order to acquire by surface contact respectively with the inner annular surface S2 and end annular surface S1 an energy that is at least partially opposed to one another. an unforeseen (or spontaneous) loosening of device D (in the presence of vibrations notably generated during transport and / or temperature variations) when the female end EF is screwed to the CP body in the final position. We will return later to this anti-slackening brake effect that results from energy acquisition.

Preferably, and as illustrated in Figures 1, 2, 4 and 5, the intermediate part P3 is preferably extended, opposite the end part P2, by a deformable damping element (or "bumper") so as to dampen the shocks. The outer diameter of the damping element EM is advantageously close to that of the female end EF.

For example, and as illustrated in Figures 3 and 5, the first sealing element L1 is a radially outwardly projecting collar (or tongue or lamella) designed to be in close contact against at least a portion of the surface. inner ring S2 of the female end EF to ensure local (first) continuous tightness throughout its circumference at this level when its device D is positioned in its final position. The tongue L1 is preferably integral with the CP (protector) body and is preferably attached thereto near its inner surface (or periphery). The ratio between the height (radial) and the thickness of the tongue (or collar) L1 is preferably greater than 1. For example it is possible to choose the order of 3. The first sealing element L1 initially has a third orientation which depends on the type of joint of which the female end EF to which device D is dedicated is part. In the example illustrated in figures 3 and 5, which corresponds to a device D intended to protect a VAM TOP type joint, the third orientation, defined by orientation of the front face (upstream) of the tongue L1 directed towards the inner annular surface S2 initially forms (i.e. before mounting the device D on the female end EF) a non-zero angle φ3 with respect to the plane perpendicular to the direction XX This angle φ3 is initially at least 10 ° greater than that φ2 than the second orientation of the inner annular surface S2 of the female end EF f form. Preferably, the initial angular difference (Δ = φ3 - φ2) between the third and second orientations is between + 10 ° and about + 30 °. Most preferably, this initial angular difference Δ is about + 15 °. Angle φ3 is chosen such that the initial contact between the tongue L1 and the inner annular surface S2 occurs on the outer side of the tongue L1.

As illustrated in figures 10 and 11A, when device D is intended to protect a VAM TOP type gasket, its first sealing element L1 covers most of the inner annular surface S2 of female end EF while being in close contact against the latter once placed in the final position. The collar (or tongue or flap) which constitutes the first sealing element L1 comprises here two substantially parallel annular faces, which initially present both the third orientation, one of which is separated from the rest of the terminal part P2 of the CP body by a relatively wide V-shaped trough (see figure 3B) to allow its axial flexion when placing device D in its final position and to compensate for dimensional differences (manufacturing and / or induced by temperature variations).

For example, and as illustrated in Figures 4 and 5, the second tightness element L2 is also a radially outwardly projecting collar (or tongue or flap) designed to be in close contact against at least a portion of the annular end surface S1 of the female end EF to ensure continuous local (second) tightness throughout its circumference at that level when its device D is placed in its final position. The tongue (or collar) L2 is preferably integral with the body (shield) CP and is preferably attached to the latter near its outer surface. The ratio between the (radial) height and the thickness of the tongue L2, taken substantially at half height of the latter, is preferably greater than 1. For example, it can be chosen from the order of 3. The second tightness element L2 initially has a fourth one. orientation (defined by the orientation of the tongue face L2 directed towards the annular end surface S1) which depends on the type of gasket of which the female end EF to which the device D is dedicated. In the example illustrated in figures 4 and 5 , which corresponds to a device D intended to protect a VAM TOP type joint, the fourth orientation initially forms (that is, prior to mounting the device D on the female end EF) an angle φ4 zero or too small with respect to the plane perpendicular to the direction. XX of component T so that the angle difference φ4 - φ1 is also zero or very small. The collar (or tongue or flap) which constitutes the second tightness element L2 then comprises two annular faces forming an acute angle to each other (see Figure 4B) so that the thickness of the collar L2 decreases towards the outside, the slanted face being separated from the rest of the intermediate part P3 of the body CP by a relatively narrow V-shaped valley to allow its axial flexion at the occasion of placing the device D in its final position and to compensate for dimensional differences (of and / or induced by temperature variations). As a result, as shown in Figures 10 and 11B, when device D is in its final position, its second tightness element L2 is only in close contact against a small portion of the annular end surface S1 of the female end EF.

It will be appreciated that when device D is intended to protect a joint of a different type than a VAM TOP, the fourth orientation may initially form a non-zero angle φ4 with respect to the plane perpendicular to the XX direction of component T. This angle φ4 is initially at least 10 ° from that φ1 that the second orientation of the annular end surface S1 of the female end EF forms. Preferably, the initial angular difference (Δ = φ4 - φ1) between the fourth and first orientations is between + 10 ° and about + 30 °. Most preferably, this initial angular difference Δ is about + 15 °. The collar (or tongue or flap) which constitutes the second sealing element L2 may then comprise two substantially parallel annular faces, initially having both the third orientation, one of which is separated from the rest of the end portion P2 of the CP body by a trough. relatively wide V-shape (as is the case with the first sealing element L1 shown in Figure 3B) to allow its axial flexion when placing device D in its final position and to compensate for dimensional differences (manufacturing and / or induced by temperature variations).

The respective dimensions of the different parts (P2, P3) constituting the CP body are chosen so that during the screwing phase illustrated in figures 5 to 10, the first sealing element L1 contacts the inner annular surface S2. female end EF before the second sealing element L2 contacts the annular end surface S1 of that same female end EF. This is what is illustrated in the non-limiting example of Figures 5 and 6. More precisely, in this example, after the ether has substantially axially introduced the body CP into the female end EF so that the beginning of its outer threading FE arrives In the case of the internal tapping flange of the female end EF (Figure 5A-first intermediate stage of the taper), the device D (Figure 5B - second intermediate stage of the taper) is screwed in until its first tightness element L1 contacts the surface. inner ring S2 of female end EF (Figures 5C and 6A - third intermediate taper stage). In this third intermediate stage of the taper, the contact between the tongue L1 and the inner annular surface S2 is made in the vicinity of the outermost part of the tongue L1, and the second tightness element L2 is positioned at a certain axial distance DA from the annular surface of. end S2 (see figures 5C and 6B). Such axial distance DA is preferably from about 0.5 mm to about 1 mm, and more preferably about 0.7 mm.

Thereafter, and as illustrated in figures 7, 8 and 9, screwing on device D is continued until the substantially transverse orientation face of the second sealing element L2 contacts the annular end surface S1 of the female end EF (see figures 7 and 9 - first final taper stage). As illustrated in Figure 8, this causes the first sealing element L1 to begin to flex axially (its initial unflected position is materialized by the dotted lines). And then, the tapping of the device D proceeds in such a way as to further increase the axial flexion of the first sealing element L1 (see Figure 11A - the intermediate bent positions are materialized by dotted lines), and on the other hand, forcing the second tightness element L2 to be axially flexed (see Figure 11B - its unflected starting position is materialized by the dotted lines). Device D is then in its final position (see figure 12). The first L1 and second L2 sealing elements being henceforth greatly deformed by axial flexion, they both acquired by surface contact with the inner annular surface S2 and female annular end surface S1 EF an elastic energy that is at least partially opposed to an unscrewing. unforeseen (or spontaneous) that may be caused by vibration and / or large temperature variations. This is what is called the anti-slackening brake. The more elastic energy stored in the first L1 and second L2 sealing elements, the greater the brake effect.

It will be appreciated that once device D is in its end position, it perfectly protects the S1 and inner end annular surfaces S2 and the inner threading F1 of the female end EF. It can be unscrewed at any time by exerting a higher force and opposite to the sum of the frictional forces suffered by the first L1 and second L2 sealing elements, without damaging the different parts of the female EF end, and without remove previously installed (dry or semi-dry) lubricant. The protection afforded by device D, being notably mechanical, its CP body and its possible damping element (or "bum-per") EM, must be somewhat rigid while at least partially absorbing the blows. To do so, it can for example be performed by injecting (or molding) a thermoplastic material into an adapted mold (in this case it is a monoblock type, that is to say done in one piece). It will be appreciated that the damping element EM may possibly be an adapted part on the CP body. In this case, it can be made of a different material than the CP body material. Among the different families of thermoplastic materials which may be advantageously used, polycarbonate-based mixtures such as polycarbonate-polyester (PC-PBT or PC-PET), polyoxymethylene or polyacetal (POM) and high or ultra high density polyethylenes (PE) (PE-HD, PE-UHD). API 5CT Edition 2005 specifies in its Annex I requirements for thread protection devices, notably minimum values for axial and bias (45 °) shock resistance for three temperatures (-46, +21 and + 66 ° C). ). It is possible, for example, to choose a PE-HD produced by BASELL and sold under the name LIPOLEN 4261 AG UV 6005, a PE-HD produced by TICONA and sold under the name GUR 5113, a PC-PBT produced by BAYER. is sold under the name MAKROBLEND S7916, or a POM produced by the company DU PONT and sold under the name DELRIN 127UV. The invention is not limited to the protective device embodiments described above, by way of example only, but rather encompasses all variants which the practitioner may consider within the scope of the claims below.

Thus, the invention also relates to other female end types than those described above (VAM TOP). For example, it also refers to female ends of tubular threaded joints, most especially with inner anvil, with gloves (eg those of type NEW VAM, VAM ACE, DINOVAM, VAM HW ST) or "flu-sh" or "semi integrals". -flush "(for example those of type VAM SL, VAM MUST, VAM HP, VAM HTF). It also refers to female ends of joints without an inner stop (for example those of type VAM SLIJN II or VAM FJL of radial tightness).

Claims (16)

1. Protective device (D) for a female end (EF) of a component (T) of a tubular threaded joint for drilling and exploration of hydrocarbon wells, fitted with at least one internal threading (Fl) and one annular end surface (S1) and an inner surface (S2) positioned respectively upstream and downstream of said internal thread (F1) and having respectively a first and a second chosen orientation, said device (D) comprising a body (CP) provided with an external threading (FE) for operating in conjunction with said internal threading (F1) and a first (L1) and second (L2) annular-type flexible sealing elements positioned upstream and downstream respectively. downstream of said outer threading (FE) and arranged to ensure first and second tightness respectively at the level of the inner surface (S2) and annular end surface (S1), that said first (L1) and second (L2) sealing elements have a third and a fourth orientation chosen, at least one of which differs from an angle of at least 10 ° with the second or first orientation. prior to tapping said device (D) at the female end (EF), and are deformable by axial flexion so as to acquire by surface contact with said inner surface (S2) and annular end surface (S1) an energy which at least partially opposes an unforeseen unscrewing when said female end (EF) is screwed into said body (CP) in an end position, and said first sealing element (L1) is realized in the form of an annular tongue, said annular tongue (L1) being connected to said body (CP) by the inner periphery of the latter and projecting towards the outside. Device according to claim 1, characterized in that the inner surface (S2) of the female end (EF) is an annular stop surface. Device according to any one of claims 1 and 2, characterized in that said body (CP) is arranged such that during the screwing phase said first sealing element (L1) contacts said body. inner surface (S2) before said second sealing element enters (L2) in contact with said annular end surface (S1). Device according to any one of claims 1 and 2, characterized in that said body (CP) is arranged such that during the screwing phase and at the moment when the first sealing element (L1) comes into contact with one another. contacting said inner surface (S2) said second sealing element (L2) is positioned at an axial distance from said annular end surface (S1) between 0.5 mm and 1 mm. Device according to any one of claims 1 to 4, characterized in that the first and fourth orientations differ initially from an angle of 10 ° to 30 °. Device according to claim 5, characterized in that said angle between the first and fourth orientations is equal to 15 °. Device according to any one of claims 1 to 4, characterized in that the second and third orientations differ initially from an angle of 10 ° to 30 °. Device according to claim 7, characterized in that said angle between the second and third orientations is equal to 15 °. Device according to any one of claims 1 to 8, characterized in that the angle between the second and third orientations decreases during tapping. Device according to any one of claims 1 to 9, characterized in that said second sealing element (L2) is made in the form of an annular tongue. Device according to any one of the preceding claims, characterized in that said first (L1) and second (L2) sealing elements may be integral with said body (CP). Device according to any one of the preceding claims, characterized in that said body (CP) is extended downstream of said second sealing element (L2) by a damping element (EM). Device according to any one of the preceding claims, characterized in that it is made of a thermoplastic material. Device according to claim 13, characterized in that said thermoplastic material is chosen from the group comprising at least polycarbonate, polyoxymethylene or polyacetal (POM) mixtures, and high density polyethylenes ( PE-HD) or ultra-high density (PE-UHD). Device according to any one of claims 13 and 14, characterized in that it is made in one piece by molding thermoplastic material. Device according to any one of claims 1 to 15, characterized in that said inner surface (S2) of the female end (EF) is a radially tightness tightness surface.